Sprsng-tooth



A. SHELLMAN.

(No Mddel.

SPRING TOOTH.

Patented Jan. 15, 1884.

No. 291.940. I

u, PETERS. mwum m. Washinglun. m:

wrran STATES A'IENI tries.

SPRlNG-TOOTFL.

SPECIFICATION forming part of Letters Patent No. 291,946, dated January 15, 1884.

(No model.)

To all whom, it may concern,

Be itknown that I, ABRAHAM SHELLMAN, a cltizen of theUnited States, residing at Charleston. (Galesburg P. 0.,) county of Kalamazoo,

State of Michigan, have invented new and useful Improvements in Spring-Tooth Harrows, of which the following is a specification.

My invention consists in an improved springtooth, the object being to produce atooth which shall be both useful and durable, as hereinafter described.

In the drawings forming a part of this specification, Figure 1 shows the tooth in perspective connected with the beam of a harrowframe, Fig. 2, a cross-section of the tooth-beam and broken edge View of lower portion of the tooth, and Fig. 3 a bottom view of the toothbeam.

The tooth-beams are made half-round on the under side. Any desirable style of harrowframe may be used. The tooth has a curved portion adapted to fitthe rounded under side of the tooth-beam B, as in other styles of springteeth, and it extends therefrom above and between said beam and the next adjacent beam, which feature is shown in the prior state of the art as well; but the bow of my tooth above and between the beams is bell-shaped, and it extends from said bell-bow downward on a like curve as the other side, but oppositely turned, and terminates in a working end on a level, or substantially so, with the secured end 0 at the other side. The tooth or the toothbeam may be canted forward, to cause the working-point to enter the ground during the operation. WVith such a style of tooth, when unduly-hard soil is met, the forward portion will spring back and rest against the rear portion in front of the tooth-beam, as indicated by dotted lines in Fig. 1. The strain on the tooth is then exerted on the working end, making it an entirely-rigid tooth for the time it is engaged in the hard soil.

Such teeth do not catch straw and like litter as readily as other styles of bowed springteeth.

What I claim is- A spring barrow-tooth consisting of a bellbow located between the tooth-beams,provided with two downwardlyextending ends on a like but oppositely-turned curve, one of said ends forming the working and the other the secured portion, substantially as set forth.

In testimony of the foregoing I have hereunto subscribed my name in the presence of two witnesses.

ABRAHAM SHELLMAN.

WVitnesses:

B. H. MGOAIN, O. N. GIDDINGS. 

